DC947A - Schematic

REVISION HISTORY
This circuit is proprietary to Linear Technology and supplied
for use with Linear Technology parts.
Customer Notice: Linear Technology has made a best effort to
design a circuit that meets customer-supplied specifications;
however, it remains the customer's responsibility to verify proper
and reliable operation in the actual application, Component
substitution and printed circuit board layout may significantly
affect circuit performance or reliability. Contact Linear
Applications Engineering for assistance.
ECO
REV
DESCRIPTION
5
1
TP5
JP2
150uF
C13
35V
VIN
TP4
J2
C10
C16
10uF
10uF
25V
Q1
PH8230E
25V
4
TP2
R20
12K
6.3V
C17
100uF
6.3V
C18
100uF
B320A
6.3V
100K [1]
U1 LT3740EDHC
Q2
PH3830L
4
R28 0
1
SN-
VC
16
2
PGND
FB
15
3
BGATE
XREF
14
4
BGDP
SHDN
13
5
SN+
PGOOD
12
RANGE
11
VIN
10
SWB
9
3
2
1
GND
GND
TP3
C25
[1]
J4
R1
D2
0.007
D3 [1]
MMSZ5230BS
VIN
BIAS
6
SW
7
TGATE
8
BIAS
GND
6.3V
C19
100uF
2
J3
C24
10uF
D1
VIN
R29
R26 0
R27 0
5
[email protected]
VOUT
L1 0.9uH
VOUT
VOLTAGE_SS
OFF
C15
1nF
2200pF
C14
100pF
ON
2
1
+ C1
J1
3
R14 0
1
VOUT
INTERNAL
R33
3
2
1
GND
22pF
REFERENCE
REFERENCE
2
1
GND
10
JP1
100K
3V-15V
VIN+
R19
R18
100K
EXTERNAL
R22
0
15K
JP3
VOUT
C20
1uF
3
Q3 2N7002TA [1]
ON
2
R25
100K
CURRENT_SS
OFF
TP6
PGOOD
VIN
L2
R2 [1]
22uH
R4 [1]
17
[1]
2
R30
1
TP1
5
VIN+
R13 0 [1]
80.6K1%
C12
3
VIN
C11
OPT
1%
EXTERNAL
3
100.0K
R15 0
APPROVED
05/24/06
VIN
R17
R16
DATE
PROD
VIN
R31 0 [1]
R32 0
C21
C23
0.01uF
VIN
C22
1uF 16V
1uF
25V
CONTRACT NO.
APPROVALS
DRAWN MEI
NOTE: UNLESS OTHERWISE SPECIFIED,
[1] OPTIONAL.
DATE
07/19/05
CHECKED
TITLE
SCH, LT3740EDHC, HIGH EFFICIENCY STEP-DOWN CONVERTER
APPROVED
ENGINEER
TECHNOLOGY
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
D. Ng
DESIGNER
SIZE
CAGE CODE
DWG NO
REV
5
DC947A
Wednesday, September 20, 2006
SCALE: NONE
FILENAME: 947A-5.DSN
SHEET
1
OF
1
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